作 者 ：Chen Wei-Pei, Zhang Si-Mei
期 刊 ：植物分类学报 1992年 5期
Keywords:Nymphaeaceae, Comparative anatomy,
Abstract:
Leaf anatomy of six genera was investigated. The petiole of Brasenia
schreberi possesses a pair of bundles, the other five possess closed, scattered
vascular bundles, resembling those of the Monocotyledons. True vessels are ab-
sent. Air passages are present in the ground tissue of the petiole except for Nuphar
pumilum. Leaves are all dorsiventral. Stomatal apparatuses of the Ranunculaceous
type are generally confined to the upper surface of the lamina, but fewer
stomata are found on the lower surface of the lamina of Nelumbo nucifera. The
stomatal apparatuses of Nelumbo nucifera are of the Haplocheilic type in develop-
ment, but of the Ranunculaceous type at maturity. Hydathodes and
sclerenchymatous idioblasts are present only in Nelumbo nucifera. Glandular hairs
and hydropotens occur on the lower surface of the lamina in all the investigated
species except Nelumbo nucifera. Astrosclereids are present in all the taxa except
Brasenia schreberi and Nelumbo nucifera. According to observations we consider
that the genus Brasenia is a primitive one in Nymphaeaceae and it has a close
phylogenetic relationship with Cabomba. They may be treated as an independent
family, Cabombaceae, which is better included in the order Nymphaeales.
Nymphaea, Nuphar, Euryale and Victoria are closely related to one another and
should be retained in the family Nymphaeaceae. Nelumbo shows, specialized fea-
tures distinct from those of the rest of the Nymphaeaceae. It should be segregated
not only as a distinct family but also as a distinct order, Nelumboales.